Not happy with recent experience

Greetings, been with telkom for past 3-4 years, never missed a payment, as payments are via debit order. N i get paid on da 25th, if ts saturday, their debit monday. So i hv nevwr had a problem. Now this month, their choose to debit on da 24th, which obviously i wont have funds, and only realise that there is a problem, when 3 of my fellow work mates made calls to telkom, as to why their debited on the 24th, cz we dnt hv funds on that date. So their all got diff explanations. So i decide to call, n was told their will redebit by first consultant. I waited for a day or two. Den made a call since no debit went theough, n was told no such will happend, system doesnt allow, so i must do eft n email proof, so fuming as i was, i did eft, n emailed. I have proof of emails. Called to confirm n spoke to third agent. Ho advised i forward email too. Did dat, then few hours later, got response from twlkom team that eft proof was recieved. Next morning, debit goes through. So now im charged twice. So i call to get an explanation as to where to from here. Teamleader was rude, not giving me way forward, but just being rude. So here i am confused, i did make eft, but stil got debited. N instead of an apology and refund request, i get told A B and C. So till now i dont know what to do, who to call, to get clarity as to whats happening with the double payments. And an official apology. Please help